package com.ywgt.springcloud.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

@Component
public class MyLB implements LoadBalance {
    private AtomicInteger atomicInteger=new AtomicInteger(0);

    public final int getAndIncrement(){
        int next;
        int current;
        do{
           current= this.atomicInteger.get();
           next=current>=2147483647 ? 0:current+1;
        }while (!this.atomicInteger.compareAndSet(current,next));
        System.out.println("**第几次访问**next"+next);
        return next;
    }
    @Override
    public ServiceInstance instances(List<ServiceInstance> serviceInstances) {
        System.out.println(serviceInstances.size());
        int index=getAndIncrement() % serviceInstances.size();
        return serviceInstances.get(index);
    }
}
